"I was fairly inventive, though I didn't get much approval from my father. I remember making a wheelbarrow when I was 9, and he laughed himself sick. That hurt me because we didn't have a wheelbarrow and in the end he used it a lot. When I was 11 or 12, I built a Wimshurst electrostatic machine, which makes sparks. I was rather proud of that. I got it to make huge lightning flashes, but it gave me headaches and I had to stop."